Problem Set 1

Problem Set 1 - Problem Set 1 Chemistry 173a/268a Due: Oct...

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Problem Set 1 Chemistry 173a/268a Due: Oct 15, 2007 1) Balance the following nuclear equations: 226 88 Ra 4 2 He + + 1 0 n 142 56 Ba + 91 36 Kr + 3 1 0 n 40 19 K+ 0 -1 e 137 55 Cs + 0 -1 e 2) Bismuth-209 was only discovered to be radioactive in 2003. It has a half-life of 1.9 × 10 19 years and decays by α -particle emission. a) What is a half-life? b) Write the balanced nuclear equation for the decay of 209 Bi. c) Speculate on why the discovery of bismuth’s radioactivity occurred only recently? 3) Using Slater’s rules calculate the effective nuclear charge for a 3s electron in (a) Mg and (b) Mg + . (c) Explain the difference in effective nuclear charge between (a) and (b). 4) List the electronic configurations for the lanthanides (elements 57 to 71). What explains the exceptions for La, Ce and Gd? (hint: use Figure 1.22 from the Shriver & Atkins, 4 th edition) 5) The actinide contraction refers to the gradual decrease in atomic and ionic radii across the 5f series. Consider the following data:
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This note was uploaded on 08/06/2008 for the course CHEM 173A taught by Professor Unknown during the Spring '08 term at UCSB.

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Problem Set 1 - Problem Set 1 Chemistry 173a/268a Due: Oct...

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